I did the same with my R26. No question that slaving first U18 and then later R26 with OCK-1 brought additive improvements in my system. Very easy to toggle clock on/off with R26 via the remote. I use two C2 cables too. But I can't disagree with
@Highfive99 that they're pricey. They're still the best cable of four I've tried and I've tried a particular highly recommended LMR400. Difference may be further burn in on LMR400 needed or a clock synergy thing. Sine is what I use as it sounds clearly better than square.
If I was going to spend C2 money now I'd look at the, IIRC correctly, slightly more expensive silver 50ohm cable that
@FredA said on the MasterClock thread beats the C2 (and by extension the LMR400 he also has) by some margin. I am considering trying one.